Allow filtering of modules before initialization

Alternative for #111

src/test/java/org/springframework/guice/annotation/EnableGuiceModulesTests.java

@@ -75,6 +75,14 @@ public class EnableGuiceModulesTests {
 		context.close();
 	}
 
+	@Test
+	public void moduleBeanFiltersOutModules() {
+		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(
+				FilteringModuleBeanConfig.class);
+		assertThat(context.getBean(Foo.class)).isNotNull();
+		context.close();
+	}
+
 	@Test
 	public void testInjectorCreationDoesNotCauseCircularDependencyError() {
 		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(MySpringConfig.class);
@@ -151,6 +159,32 @@ public class EnableGuiceModulesTests {
 
 	}
 
+	@Configuration(proxyBeanMethods = false)
+	@EnableGuiceModules
+	protected static class FilteringModuleBeanConfig {
+
+		@Bean
+		public static MyModule2 module2() {
+			return new MyModule2();
+		}
+
+		@Bean
+		public static MyModule module() {
+			return new MyModule();
+		}
+
+		@Bean
+		public Foo service(Service service) {
+			return new Foo(service);
+		}
+
+		@Bean
+		ModuleFilter moduleFilter() {
+			return module -> !(module instanceof MyModule2);
+		}
+
+	}
+
 	protected static class MyModule extends AbstractModule {
 
 		@Override
@@ -160,6 +194,15 @@ public class EnableGuiceModulesTests {
 
 	}
 
+	protected static class MyModule2 extends AbstractModule {
+
+		@Override
+		protected void configure() {
+			throw new RuntimeException("This should not be called when filtered out!");
+		}
+
+	}
+
 	public static class SpringProvidedBean {
 
 		public SpringProvidedBean(GuiceProvidedBean guiceProvidedBean) {